The 4th International Conference on Driver Distraction and Inattention (DDI 2015) organised by the ARRB Group together with SAFER took place with great success was held in Sydney, Australia, on 9-11 November 2015. As driver distraction and inattention continue to be major contemporary road safety problems worldwide, DDI 2015 brought into the spotlight developments in research from mainstream and neighbouring disciplines, and showcased new and emerging technologies, products and countermeasures. The major themes for the conference this year included distraction and the automated vehicle, and the relationship between research findings yielded in experimental versus real world studies.